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Photocatalytic Activity of Lanthanum DopedNanometer Titanium Dioxide

QINA Si-wen, WANG Zhi-ye, WANG Min-quan (Depart.of Mater.Sci.and Eng.,Zhejiang Univ.,Hangzhou 310027,China)  
The nanometer TiO-2 powders doped with La 3+ were prepared from Ti(OC-4H 9)-4 and LaCl-3 by Sol-Gel processing.The photocatalytic activity of samples at different doping concentration and different heat treatment temperature in photocatalytic degradation of congo red was discussed.The influence of phase composition,cell parameters and crystallite sizes on the photocatalytic activity of La 3+ doped TiO-2 samples were nalyzed by X-ray diffraction(XRD) and transmission electron microscopy(TME) measurement.Results showed that La 3+ doping increased the photocatalytic activity of TiO-2 greatly, the fitting doping concentration was 100∶3.0, the fitting heat treatment temperature was 600℃;phase composition of La 3+ doped TiO-2 was the determinant factor which influenced the photocatalytic activity;the influence of crystal lattice expanding and crystal size were notable only when the phase content was equal or similar.
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